appraise "rails-3" do
  gem "rails", "3.2.22"
end

appraise "rails-4" do
  gem "rails", "4.2.5"
end

appraise "rails-5" do
  gem 'rails', github: 'rails/rails'
  gem 'rack',  github: 'rack/rack'
  gem 'arel',  github: 'rails/arel'
end
